EP-4737612-A1 - COATING STRUCTURE MANUFACTURING METHOD, AND COATING STRUCTURE

Abstract

A method for producing a coating structure of the present invention is a method for producing a coating structure having a metal composite coating on a substrate, the method including a step of applying or immersing a metal compound-containing substance on the substrate, and a reaction step of forming a metal composite coating by performing at least one reaction of a carbonization reaction, a carbonitriding reaction, or a nitriding reaction by heating the substrate in a state where a carbon source and/or a nitrogen source is supplied under reduced pressure or vacuum. In the coating structure of the present invention, the metal-carbon composite coating has a D band/G band peak area ratio in Raman spectroscopy of 0.5 or more and 2.0 or less.

Inventors

• HARA, SYUHEI
• KONDO, AKIHIRO
• NIKATA, Soichiro
• TSUBOTA, TERUKAZU
• UEJIMA, YASUTSUGU

Assignees

• Mitsui Kinzoku Company, Limited
• Kunitomo Nekkou Co. Ltd.

Dates

Publication Date

20260506

Application Date

20240628

Claims (15)

1. A method for producing a coating structure having a metal composite coating on a substrate, the method comprising: a step of applying or immersing a metal compound-containing substance on the substrate; and a reaction step of forming a metal composite coating by performing at least one reaction of a carbonization reaction, a carbonitriding reaction, or a nitriding reaction by heating the substrate in a state where a carbon source and/or a nitrogen source is supplied under reduced pressure or vacuum.
2. The method for producing a coating structure according to claim 1, comprising a drying step of drying the substrate coated or immersed with the metal compound-containing substance.
3. The method for producing a coating structure according to claim 1, wherein a step of applying or immersing the metal compound-containing substance on the substrate and the reaction step are repeated a plurality of times.
4. The method for producing a coating structure according to any one of claims 1 to 3, wherein the substrate contains at least one selected from the group consisting of carbon, a metal carbide, a pure metal, an alloy, a metal oxide, and a composite metal oxide.
5. The method for producing a coating structure according to any one of claims 1 to 3, wherein the metal composite coating contains a compound of at least one metal element selected from Ti, Nb, Mo, Hf, Ta, W, Zr, and Si.
6. The method for producing a coating structure according to any one of claims 1 to 3, wherein the metal composite coating contains a compound of at least one metal element selected from Nb, Hf, and Ta.
7. The method for producing a coating structure according to any one of claims 1 to 3, wherein the metal composite coating contains at least one metal carbide selected from Ti carbide, Nb carbide, Mo carbide, Hf carbide, Ta carbide, W carbide, Zr carbide, and Si carbide.
8. The method for producing a coating structure according to any one of claims 1 to 3, wherein the metal compound-containing substance has a maximum value of light transmittance in a wavelength region of 500 nm to 700 nm of 70%T or more and a particle size (D50) of particles in the metal compound-containing substance in dynamic light scattering of 3,000 nm or less.
9. The method for producing a coating structure according to any one of claims 1 to 3, wherein the reaction step is a carbonization reaction, and the carbon source is one containing an unsaturated hydrocarbon and an inert component or a saturated hydrocarbon.
10. The method for producing a coating structure according to any one of claims 1 to 3, wherein the reaction step is a carbonitriding reaction or a nitriding reaction, and the nitrogen source contains ammonia and an inert component.
11. The method for producing a coating structure according to any one of claims 1 to 3, wherein in the reaction step, a heating temperature is 500°C or higher and 1150°C or lower.
12. The method for producing a coating structure according to claim 11, wherein in the reaction step, a heating time is 0.05 hours or more and 10 hours or less.
13. A coating structure having a metal composite coating on a substrate, wherein the metal composite coating is formed by performing at least one reaction of a carbonization reaction, a carbonitriding reaction, or a nitriding reaction by heating a substrate coated or immersed with a metal compound-containing substance in a state where a carbon source and/or a nitrogen source is supplied under reduced pressure or vacuum.
14. A coating structure having a metal-carbon composite coating on a substrate, wherein the metal-carbon composite coating has a D band/G band peak area ratio in Raman spectroscopy of 0.5 or more and 2.0 or less.
15. A coating structure having a metal-carbon composite coating on a substrate, wherein the metal-carbon composite coating has a D band/G band peak area ratio in Raman spectroscopy of 0.5 or more and 2.0 or less and a standard deviation of the D band/G band peak area ratio of 0.1 or more and 0.35 or less.

Description

Technical Field The present invention relates to a method for producing a coating structure, and a coating structure. Background Art In metalworking, a carburizing method, a carbonitriding method, and a nitriding method are performed for the purpose of hardening a surface layer. For example, Patent Literature 1 discloses a method for hardening a surface of a steel workpiece by bringing a hardening gas in which carbon or nitrogen and hydrogen are bonded into contact with the steel workpiece in a treatment furnace under a vacuum atmosphere. Citation List Patent Literature Patent Literature 1: JP 6058846 B1 Summary of Invention Technical Problem However, in the method disclosed in Patent Literature 1, properties such as physical and/or chemical stability of a steel workpiece, that is, a surface layer formed by carburizing, carbonitriding and nitriding a surface of a substrate, have depended on the type and material of the substrate. In view of the above problems, an object of the present invention is to provide a method for producing a coating structure, which can form a physically and chemically stable surface layer independent of a substrate and can produce a coating structure having a uniform metal composite coating on the substrate, and a coating structure. Solution to Problem A method for producing a coating structure of the present invention made to solve the above problems is a method for producing a coating structure having a metal composite coating on a substrate, the method including a step of applying or immersing a metal compound-containing substance on the substrate, and a reaction step of forming a metal composite coating by performing at least one reaction of a carbonization reaction, a carbonitriding reaction, or a nitriding reaction by heating the substrate in a state where a carbon source and/or a nitrogen source is supplied under reduced pressure or vacuum. The method for producing a coating structure of the present invention can produce a coating structure having a uniform metal composite coating on a substrate, which can form a physically and chemically stable surface layer independent of the substrate. In the present description, the "metal composite coating" may be present in a state in which a metal element is bonded to another metal element, a metalloid element, or a non-metal element in the coating. In addition, the metal element may be present in a mixed or dispersed state, not in a state in which a metal element is bonded to another metal element, a metalloid element, or a non-metal element in the coating. Examples of the metal compound include metal carbides, metal nitrides, metal carbonitrides, metal oxides, metal sulfides, and metal hydroxides, and metal carbides, metal nitrides, and metal carbonitrides are preferable, and a plurality of compounds may be present. Here, the coating structure to be produced by the method for producing a coating structure of the present invention includes a coating structure having a metal-composite coating on a substrate, and for example, a coating structure having a metal-composite coating on at least one surface (for example, the surface) of the substrate, a coating structure having a metal-composite coating on the entire peripheral surface of the substrate, and a coating structure having a metal-composite coating on a part of one surface of the substrate. First, in the step of applying or immersing the metal compound-containing substance on the substrate according to the method for producing a coating structure of the present invention, the metal compound-containing substance is applied or immersed on the substrate. The substrate used in the method for producing a coating structure of the present invention contains at least one selected from the group consisting of carbon, a metal carbide, a pure metal, an alloy, a metal oxide, and a composite metal oxide. The substrate used in the method for producing a coating structure of the present invention may be a substrate containing at least one selected from the group consisting of carbon, a metal carbide, a pure metal, an alloy, a metal oxide, and a composite metal oxide described later. The substrate containing carbon may be a substrate composed only of carbon, a substrate containing carbon as a main component and having a carbon content of 50 mass% or more, or a substrate having a multilayer structure and having an outermost layer composed only of carbon or containing carbon as a main component and having a carbon content of 50 mass% or more. The substrate containing carbon is particularly preferably a substrate composed only of carbon. Also, the size and shape of the substrate containing carbon are not particularly limited as long as the carbon substrate can be heated in a stationary furnace used in a step to be described later. Specific examples of the carbon substrate include a crucible, a furnace material, an electrode, a fiber, a filtration device, a filter, a protective tube, a heater tube, a